Ecology: Nerodia clarkii is the only North American snake species restricted to a brackish water environment and has evolved behavioral (Pettus 1963) and physiological (Dunson 1980) specializations associated with a salt tolerance.

Habitat: at least partially coastal and thus considered (partially) “marine”. See also Ecology.

References

Allen, Morrow J. 1932. A survey of the Amphibians and reptiles of Harrison County, Mississippi. American Museum Novitates (542): 1-20 - get paper here

Dunson WA 1980. The relation of sodium and water balance to survival in sea water of estuarine and freshwater races of the snakes Nerodia fasciata, N. sipedon and N. valida. Copeia 1980:268–280 - get paper here